This guide was created for the ASUS RT-AC66U router with Firmware Version 3.0.0.4.380_8120. FusionPBX is in the cloud with a public IP, and the ASUS RT-AC66U router is at the customer’s location with the extensions behind it. The RT-AC66U is a “prosumer” grade router. It has good performance for the dollar and is a good choice for home offices.

On the top-right selection box, select “user-defined QoS rules” if it is not already selected

Your settings may vary based on your environment, but you can use the image below as a good starting point.

It is important to note that the default rules set “Web Surf” and “HTTPS” to highest priority. We don’t want that to compete with VOIP traffic, so reduce those to “High.”

Click Apply.

Note

An important note regarding Priorities

Another important area is the “user-defined priorities” section of Traffic Manager – QoS. As you can see, the default rules give a very large amount of the bandwidth share to the highest priority. This is very likely excessive for VOIP traffic. We don’t need much bandwidth, we just need to make sure we get prioritized traffic. You should adjust these to suit your environment.

This guide was created for the ASUS RT-AC66U router with Firmware Version 3.0.0.4.380_8120. FusionPBX is in the cloud with a public IP, and the ZyXEL USG60 router is at the customer’s location with the extensions behind it. The RT-AC66U is a “prosumer” grade router. It has good performance for the dollar and is a good choice for home offices.

How to Disable SIP ALG

Log into the router

On the left nav menu, click “WAN”

Click the “NAT Passthrough” tab at the top-right

Set “SIP Passthrough” to Disable

Click Apply

Reboot the router.

This part is a little confusing. It seems that ASUS has either reversed the meaning of SIP Passthrough or changed how it works over a few firmware releases. At any rate, if you have difficulties with Audio or Registrations, you can try toggling this setting. With these home-grade routers you should perform a full reboot in order to clear the tables before testing the phones.